SN74LVC257ANSR集成電路（IC）的信號開關(guān)多路復(fù)用器解碼器規(guī)格書PDF中文資料

SN74LVC257ANSR屬于集成電路（IC）的信號開關(guān)多路復(fù)用器解碼器。由德州儀器制造生產(chǎn)的SN74LVC257ANSR信號開關(guān)，多路復(fù)用器，解碼器邏輯型信號開關(guān)、多路復(fù)用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進(jìn)行路由和選擇。這些器件與設(shè)計用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內(nèi)的無窮變化量。

1 Features

? Operate from 1.65V to 3.6V

? Inputs accept voltages to 5.5V

? Maximum tpd of 4.6ns at 3.3V

? Typical VOLP (output ground bounce)

<0.8V at VCC = 3.3V, TA = 25°C

? Typical VOHV (output VOH undershoot)

>2V at VCC = 3.3V, TA = 25°C

? Latch-up performance exceeds 250mA per JESD

17

? ESD protection exceeds JESD 22

– 2000V human-body model (A114-A)

– 200V machine model (A115-A)

? On products compliant to MIL-PRF-38535, all

parameters are tested unless otherwise noted. On

all other products, production processing does not

necessarily include testing of all parameters.

2 Applications

? Cable Modem Termination Systems

? Tests and Measurements

? I/O Expanders

? Motor Drivers

? Network Switches

? Servers

? Telecom Infrastructure

3 Description

These quadruple 2-line to 1-line data selectors and

multiplexers are designed for 1.65V to 3.6V VCC

operation.

The SNx4LVC257A devices are designed to multiplex

signals from 4-bit data sources to 4-output data lines

in bus-organized systems. The 3-state outputs do not

load the data lines when the output-enable ( OE) input

is at a high logic level.

Inputs can be driven from either 3.3V or 5V devices.

This feature allows the use of these devices as

translators in a mixed 3.3V or 5V system

environment.